A large fire broke out on Monday at a weapons depot run by an Iraqi militia group, causing explosions heard across Baghdad, killing one person and injuring 29 others, authorities said.

Axar.az reports that the depot, run by a militia group under the umbrella of the Iran-backed Popular Mobilization Forces, was located inside a federal police base in the southern suburbs of Baghdad.

The facility stored short-range and Katyusha missiles, a security source mentioned.

The fire set off some of the rockets which struck neighborhoods several kilometers (miles) away and injuring mainly children, said Qasim al-Attabi, a spokesman for the district’s health directorate.

Health Ministry spokesman Saif Badr said most of the wounded were discharged from area hospitals with light wounds.

A police source said the fire was probably caused by negligence leading to poor storage conditions and high temperatures. The Interior Ministry ordered an investigation.